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href="/categories/Vue%E6%A1%86%E6%9E%B6%E7%AC%94%E8%AE%B0/">Vue框架笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="Vue第一天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="Vue第一天"><a href="#Vue第一天" class="headerlink" title="Vue第一天"></a>Vue第一天</h3><h2 id="1-vue初始-x2F-创建vue实例对象"><a href="#1-vue初始-x2F-创建vue实例对象" class="headerlink" title="1. vue初始&#x2F;创建vue实例对象"></a>1. vue初始&#x2F;创建vue实例对象</h2><ol><li><p>让vue工作, 就必须创建一个vue实例 且要传入一个配置对象</p></li><li><p>box容器的代码依然符合html规范 只是混入了特殊vue语法</p></li><li><p>box容器里的代码称为: Vue模板</p></li><li><p>vue实例和容器是一一对应的</p></li><li>中要写js表达式 且xxx可自动读取data中所有属性</li><li><p>一旦data中数据改变 页面用到的数据也会自动更新</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    &lt;!-- <span class="number">3.</span> &#123;&#123;对象名&#125;&#125; 为插件表达式 插入vue实例数据 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>Hello, &#123;&#123;name.toUpperCase()&#125;&#125; &#123;&#123;age&#125;&#125;<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="comment">// 1. 设置为false 以阻止vue在启动时生成生产提示</span></span><br><span class="line"><span class="title class_">Vue</span>.<span class="property">config</span>.<span class="property">productionTip</span> = <span class="literal">false</span></span><br><span class="line"><span class="comment">// 最好在配置调整好后 在继续写Vue代码</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. 创建vue实例 &#123;&#125; 是配置对象</span></span><br><span class="line"><span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>, <span class="comment">// el是指定当前vue实例为哪个容器服务 值为css选择器</span></span><br><span class="line">    <span class="attr">data</span>: &#123; <span class="comment">// data是存储数据的 为指定容器使用  </span></span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;小城故事xc&#x27;</span>,</span><br><span class="line">        <span class="attr">age</span>: <span class="number">18</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="2-vue的模板-x2F-指令语法"><a href="#2-vue的模板-x2F-指令语法" class="headerlink" title="2. vue的模板&#x2F;指令语法"></a>2. vue的模板&#x2F;指令语法</h2><h4 id="Vue模板语法有2大类"><a href="#Vue模板语法有2大类" class="headerlink" title="Vue模板语法有2大类:"></a>Vue模板语法有2大类:</h4><h3 id="1-插值语法"><a href="#1-插值语法" class="headerlink" title="1. 插值语法"></a>1. 插值语法</h3><ol><li>功能: 用于解析标签体内容</li><li>写法: 中要写js表达式 且xxx可自动读取data中所有属性</li><li>多级对象这样写:</li></ol><h3 id="2-指令语法"><a href="#2-指令语法" class="headerlink" title="2. 指令语法"></a>2. 指令语法</h3><ol><li>功能: 用于解析标签(包括: 标签属性、内容、绑定事件)</li><li>举例: &lt;a v-bind:href&#x3D;”xx” 或简写为 :href&#x3D;”xx”&gt;</li><li>且可以直接读取到data中所有属性</li><li>vue中有很多的指令, 且形式都是: v-???</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>插值语法<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h2</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span></span><br><span class="line">    &lt;hr&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>指令语法<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-bind:href</span>=<span class="string">&quot;url&quot;</span> <span class="attr">v-bind:x</span>=<span class="string">&quot;age&quot;</span>&gt;</span>百度搜索<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line">    &lt;!-- 简写指令 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">a</span> <span class="attr">:href</span>=<span class="string">&quot;url&quot;</span> <span class="attr">:x</span>=<span class="string">&quot;age&quot;</span>&gt;</span>&#123;&#123;all.name&#125;&#125;<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>,</span><br><span class="line">    <span class="attr">data</span>: &#123;</span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;jack&#x27;</span>,</span><br><span class="line">        <span class="attr">url</span>: <span class="string">&#x27;https://baidu.com&#x27;</span>,</span><br><span class="line">        <span class="attr">age</span>: <span class="number">18</span>,</span><br><span class="line">        <span class="attr">all</span>: &#123;</span><br><span class="line">            <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="3-vue的单项-x2F-双项数据绑定"><a href="#3-vue的单项-x2F-双项数据绑定" class="headerlink" title="3. vue的单项&#x2F;双项数据绑定"></a>3. vue的单项&#x2F;双项数据绑定</h2><ol><li>Vue有2中数据绑定方式:</li><li><strong>单选数据绑定(v-bind): 数据只能从data流向页面</strong></li><li><strong>双选数据绑定(v-model): 数据不仅能从data流向页面, 还可从页面流向data</strong></li><li>双向绑定一般应用在表单类元素上(input、select…)</li><li>v-model:value 可简写为v-model 因为默认收集的就是value值</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    &lt;!-- 普通写法 --&gt;</span><br><span class="line">    单项数据绑定: &lt;input type=&quot;text&quot; v-bind:value=&quot;name&quot;&gt;&lt;br&gt;</span><br><span class="line">    双项数据绑定: &lt;input type=&quot;text&quot; v-model:value=&quot;name&quot;&gt;&lt;br&gt;</span><br><span class="line">    &lt;!-- 简写 --&gt;</span><br><span class="line">    单项数据绑定: &lt;input type=&quot;text&quot; :value=&quot;name&quot;&gt;&lt;br&gt;</span><br><span class="line">    双项数据绑定: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt;</span><br><span class="line">    &lt;!-- 下面代码是错误的 v-model只能应用在表单元素上(输入类元素) --&gt;</span><br><span class="line">    &lt;!-- &lt;h2 v-model:x=&quot;name&quot;&gt;你好&lt;/h2&gt; --&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">new Vue(&#123;</span><br><span class="line">    el: &#x27;.box&#x27;,</span><br><span class="line">    data: &#123;</span><br><span class="line">        name: &#x27;小城故事&#x27;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="4-el和data的两种写法"><a href="#4-el和data的两种写法" class="headerlink" title="4. el和data的两种写法"></a>4. el和data的两种写法</h2><h3 id="1-el有两种写法"><a href="#1-el有两种写法" class="headerlink" title="1. el有两种写法:"></a>1. el有两种写法:</h3><ol><li>new Vue时候配置el属性</li><li>先创建vue实例, 再通过vm.$mount(‘#root’)指定el的值</li></ol><h3 id="2-data有两种写法-1-对象式-2-函数式"><a href="#2-data有两种写法-1-对象式-2-函数式" class="headerlink" title="2. data有两种写法:  1. 对象式   2.函数式"></a>2. data有两种写法: 1. 对象式 2.函数式</h3><ol><li>目前哪种写法都可以, 但组件化必须使用函数式, 否则报错</li><li>原则: 由Vue管理的函数, 一定不要写箭头函数, 写了this就不是vue实例了</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> v = <span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="comment">// el: &#x27;.box&#x27;, </span></span><br><span class="line">    <span class="attr">data</span>:<span class="keyword">function</span> (<span class="params"></span>) &#123;    <span class="comment">// data函数式写法</span></span><br><span class="line">        <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">this</span>) <span class="comment">// 指向vue实例对象</span></span><br><span class="line">        <span class="keyword">return</span> &#123;</span><br><span class="line">            <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="comment">// 01. el的两种写法</span></span><br><span class="line"><span class="comment">// 1. 第一种写法: el: &#x27;.box&#x27;</span></span><br><span class="line"><span class="comment">// 2. 第二种写法: $mount</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(v)</span><br><span class="line"><span class="comment">// 配合定时器使用</span></span><br><span class="line"><span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">    v.$mount(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line">&#125;, <span class="number">500</span>)</span><br><span class="line"><span class="comment">// 02. data的两种写法</span></span><br><span class="line"><span class="comment">// 1. 第一种写法: 对象式 data: &#123;&#125;</span></span><br><span class="line"><span class="comment">// 2. 第二种写法: 函数式 组件化会用到</span></span><br></pre></td></tr></table></figure><h2 id="5-Vue的MVVM的模型"><a href="#5-Vue的MVVM的模型" class="headerlink" title="5. Vue的MVVM的模型"></a>5. Vue的MVVM的模型</h2><ol><li>M(模型): data中的数据</li><li>V(视图): 模板代码</li><li>VM(视图模型): Vue实例</li><li>data中所有属性, 最后都出现在vm身上</li><li>vm身上所有属性 及vue原型上所有属性, 在vue模板中都可以直接使用</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h4</span>&gt;</span>测试一下: &#123;&#123;1+1&#125;&#125;<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h4</span>&gt;</span>测试一下: &#123;&#123;$options&#125;&#125;<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h4</span>&gt;</span>测试一下: &#123;&#123;$emit&#125;&#125;<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="keyword">let</span> vm = <span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>,</span><br><span class="line">    <span class="attr">data</span>: &#123;</span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(vm)</span><br></pre></td></tr></table></figure><h2 id="6-Object-defineProperty数据代理方法"><a href="#6-Object-defineProperty数据代理方法" class="headerlink" title="6. Object.defineProperty数据代理方法"></a>6. Object.defineProperty数据代理方法</h2><ol><li>defineProperty(对象名, ‘添加的值’) 可以为对象添加属性值</li><li>但添加的对象不能被遍历</li><li>数据代理: 当读取obj的age属性时, get函数会被调用, 且返回值是age的值</li><li>数据劫持: 当修改obj的age属性时, set函数会被调用, 且会收到修改的具体指</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num = <span class="number">18</span></span><br><span class="line"><span class="keyword">let</span> obj = &#123;</span><br><span class="line">    <span class="attr">name</span>: <span class="string">&#x27;小城&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="title class_">Object</span>.<span class="title function_">defineProperty</span>(obj, <span class="string">&#x27;age&#x27;</span>, &#123;</span><br><span class="line">    <span class="comment">// value: 18,</span></span><br><span class="line">    <span class="comment">// enumerable: true,  // 控制属性是否可以枚举 默认false</span></span><br><span class="line">    <span class="comment">// writable: true,    // 控制属性是否可以被修改 默认false</span></span><br><span class="line">    <span class="comment">// configurable: true, // 控制属性是否可以被删除 默认false</span></span><br><span class="line">    <span class="comment">// 数据代理 当读取obj的age属性时, get函数会被调用, 且返回值是age的值</span></span><br><span class="line">    <span class="title function_">get</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;你读取了age属性&#x27;</span>)</span><br><span class="line">        <span class="keyword">return</span> num</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="comment">// 数据劫持 当修改obj的age属性时, set函数会被调用, 且会收到修改的具体指</span></span><br><span class="line">    <span class="title function_">set</span>(<span class="params">value</span>) &#123;</span><br><span class="line">        <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;你修改了age属性, 且值为&#x27;</span>, value)</span><br><span class="line">        <span class="keyword">return</span> num = value</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(obj)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="title class_">Object</span>.<span class="title function_">keys</span>(obj))</span><br></pre></td></tr></table></figure><h2 id="7-理解数据代理"><a href="#7-理解数据代理" class="headerlink" title="7. 理解数据代理"></a>7. 理解数据代理</h2><ol><li>数据代理: 通过一个对象代理对另一个对象中属性的操作(读&#x2F;写)</li><li>可通过obj1访问和修改obj的属性</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> obj = &#123;<span class="attr">x</span>: <span class="number">10</span>&#125;</span><br><span class="line"><span class="keyword">let</span> obj1 = &#123;<span class="attr">y</span>: <span class="number">20</span>&#125;</span><br><span class="line"><span class="title class_">Object</span>.<span class="title function_">defineProperty</span>(obj1, <span class="string">&#x27;x&#x27;</span>, &#123;</span><br><span class="line">    <span class="title function_">get</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> obj.<span class="property">x</span></span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="title function_">set</span>(<span class="params">value</span>) &#123;</span><br><span class="line">        obj.<span class="property">x</span> = value</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(obj)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(obj1)</span><br></pre></td></tr></table></figure><h2 id="8-vue中的数据代理"><a href="#8-vue中的数据代理" class="headerlink" title="8. vue中的数据代理"></a>8. vue中的数据代理</h2><ol><li>Vue中的数据代理: 通过vm对象来代理data对象属性的操作(读&#x2F;写)</li><li>Vue数据代理的好处: 更加方便的操作data中的数据</li><li>基本原理:</li><li>通过Object.defineProperty()把data对象中所有属性添加到vm上</li><li>为每个添加到vm上的属性, 都指定一个getter&#x2F;setter方法</li><li>在getter&#x2F;setter内部去操作(读&#x2F;写)data中对应的属性</li><li>vm中的data就是Vue实例对象中的_data属性</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="keyword">let</span> vm = <span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>,</span><br><span class="line">    <span class="attr">data</span>: &#123;</span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(vm)</span><br></pre></td></tr></table></figure><h2 id="9-vue的事件绑定"><a href="#9-vue的事件绑定" class="headerlink" title="9. vue的事件绑定"></a>9. vue的事件绑定</h2><ol><li>使用v-on:xxx 或 @xxx 绑定事件, 其中xxx是事件名</li><li>事件的回调需要配置在methods对象中, 最终会在vm上</li><li>methods中配置的函数, 不要用箭头函数, 否则this就不是vm</li><li>methods中配置的函数, 都是被Vue所管理的函数, this指向是vm或组件实例对象</li><li>@click&#x3D;’show’ 和 @click&#x3D;’show($event)’ 作用一致, 但后者可以传参</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h1</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">button</span> <span class="attr">v-on:click</span>=<span class="string">&quot;show&quot;</span>&gt;</span>点击我啊<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line">    &lt;!-- 简写 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;show&quot;</span>&gt;</span>点击我啊 (不带传参)<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;show1($event, 666)&quot;</span>&gt;</span>点击我啊 (带传参)<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;   </span><br><span class="line"><span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>,</span><br><span class="line">    <span class="attr">data</span>: &#123;</span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">methods</span>: &#123;</span><br><span class="line">        <span class="title function_">show</span>(<span class="params">e</span>) &#123;</span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(e.<span class="property">target</span>)</span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">this</span>) <span class="comment">// 指向vm实例对象</span></span><br><span class="line">            <span class="title function_">alert</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="title function_">show1</span>(<span class="params">event, number</span>) &#123;</span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(event, number)</span><br><span class="line">            <span class="title function_">alert</span>(<span class="string">`你好, <span class="subst">$&#123;number&#125;</span>`</span>)</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="10-vue的事件修饰符"><a href="#10-vue的事件修饰符" class="headerlink" title="10. vue的事件修饰符"></a>10. vue的事件修饰符</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h3</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">1.</span> 阻止事件默认行为(常用) --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;https://baidu.com&quot;</span> @<span class="attr">click.prevent</span>=<span class="string">&quot;show&quot;</span>&gt;</span>点我提示信息<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line">    &lt;!-- 小技巧: 修饰符可以连续写入: 阻止默认行为和阻止冒泡 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;https://baidu.com&quot;</span> @<span class="attr">click.prevent.stop</span>=<span class="string">&quot;show&quot;</span>&gt;</span>修饰符可以连续写入<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">2.</span> 阻止事件冒泡(常用) --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;demo&quot;</span> @<span class="attr">click</span>=<span class="string">&quot;show&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click.stop</span>=<span class="string">&quot;show&quot;</span>&gt;</span>阻止事件冒泡<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">3.</span> 事件只触发一次(常用) --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">button</span> @<span class="attr">click.once</span>=<span class="string">&quot;show&quot;</span>&gt;</span>点我只触发一次<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">4.</span> 使用事件的捕获模式 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;demo1&quot;</span> @<span class="attr">click.capture</span>=<span class="string">&quot;show1(1)&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        使用事件的捕获模式</span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;demo2&quot;</span> @<span class="attr">click</span>=<span class="string">&quot;show1(2)&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">            使用事件的捕获模式</span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">5.</span> 只有e.<span class="property">target</span>是当前操作的元素时才触发事件 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;demo&quot;</span> @<span class="attr">click.self</span>=<span class="string">&quot;show&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;show&quot;</span>&gt;</span>e.target阻止事件冒泡<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    &lt;!-- <span class="number">6.</span> 事件的默认行为立即执行, 无需等待事件回调完成 --&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">ul</span> @<span class="attr">wheel.passive</span>=<span class="string">&quot;show2&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">li</span>&gt;</span>1<span class="tag">&lt;/<span class="name">li</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">li</span>&gt;</span>2<span class="tag">&lt;/<span class="name">li</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="keyword">new</span> <span class="title class_">Vue</span>(&#123;</span><br><span class="line">    <span class="attr">el</span>: <span class="string">&#x27;.box&#x27;</span>,</span><br><span class="line">    <span class="attr">data</span>: &#123;</span><br><span class="line">        <span class="attr">name</span>: <span class="string">&#x27;小城故事&#x27;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">methods</span>: &#123;</span><br><span class="line">        <span class="title function_">show</span>(<span class="params">e</span>) &#123;</span><br><span class="line">            <span class="comment">// e.preventDefault() vue里这样写: prevent</span></span><br><span class="line">            <span class="comment">// e.stopPropagation() vue里这样写: stop</span></span><br><span class="line">            <span class="title function_">alert</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="title function_">show1</span>(<span class="params">msg</span>) &#123;</span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(msg)</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="title function_">show2</span>(<span class="params"></span>) &#123;</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt;= <span class="number">100000</span>; i++) &#123;</span><br><span class="line">                <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">1</span>)</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;累坏了&#x27;</span>)</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="11-vue的键盘事件"><a href="#11-vue的键盘事件" class="headerlink" title="11. vue的键盘事件"></a>11. vue的键盘事件</h2><ol><li>Vue中常用的按键别名: enter、delete、esc、space、tab、up、down、left、right</li><li>Vue未提供别名按键, 可使用按键原始的key值去绑定, 但注意短横线命名(caps-lock)</li><li>CapsLock是个特殊事件, 要写成caps-lock才行</li><li>系统修饰键(用法特殊): ctrl、alt、shift、meta</li><li>配合keyup使用: 按下修饰键的同时, 按下其他键, 事件才会触发</li><li>配合keydown使用: 正常触发事件</li><li>可定制按键别名: Vue.config.keyCodes.自定义键名 &#x3D; 键码</li><li>使用keyCode指定具体按键(不推荐)</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">h2</span>&gt;</span>你好, &#123;&#123;name&#125;&#125;<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">placeholder</span>=<span class="string">&quot;按下回车提示&quot;</span> @<span class="attr">keyup.enter</span>=<span class="string">&quot;show&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="comment">&lt;!-- Ctrl虽然可配合其他键使用,但如果只能Ctrl+Y才能触发后面得.Y --&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">placeholder</span>=<span class="string">&quot;按下回车提示&quot;</span> @<span class="attr">keyup.ctrl.y</span>=<span class="string">&quot;show&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">new Vue(&#123;</span></span><br><span class="line"><span class="language-xml">    el: &#x27;.box&#x27;,</span></span><br><span class="line"><span class="language-xml">    data: &#123;</span></span><br><span class="line"><span class="language-xml">        name: &#x27;小城&#x27;</span></span><br><span class="line"><span class="language-xml">    &#125;,</span></span><br><span class="line"><span class="language-xml">    methods: &#123;</span></span><br><span class="line"><span class="language-xml">        show(e) &#123;</span></span><br><span class="line"><span class="language-xml">            // if (e.key !== &#x27;Enter&#x27;) return</span></span><br><span class="line"><span class="language-xml">            console.log(e.target.value)</span></span><br><span class="line"><span class="language-xml">        &#125;</span></span><br><span class="line"><span class="language-xml">    &#125;</span></span><br><span class="line"><span class="language-xml">&#125;)</span></span><br></pre></td></tr></table></figure><h2 id="12-姓名案例-插值语法实现"><a href="#12-姓名案例-插值语法实现" class="headerlink" title="12. 姓名案例-插值语法实现"></a>12. 姓名案例-插值语法实现</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    姓: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    名: &lt;input type=&quot;text&quot; v-model=&quot;names&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;name.slice(0, 3)&#125;&#125; - &#123;&#123;names&#125;&#125;&lt;/span&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">new Vue(&#123;</span><br><span class="line">    el: &#x27;.box&#x27;,</span><br><span class="line">    data: &#123;</span><br><span class="line">        name: &#x27;张&#x27;,</span><br><span class="line">        names: &#x27;三&#x27;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="13-姓名案例-methods属性实现"><a href="#13-姓名案例-methods属性实现" class="headerlink" title="13. 姓名案例-methods属性实现"></a>13. 姓名案例-methods属性实现</h2><ol><li>data数据发生变化, vue模板会重新解析一遍</li><li>vue模板里如果调用函数了, 函数也会被插值语法调用</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    姓: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    名: &lt;input type=&quot;text&quot; v-model=&quot;names&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;fn()&#125;&#125;&lt;/span&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">new Vue(&#123;</span><br><span class="line">    el: &#x27;.box&#x27;,</span><br><span class="line">    data: &#123;</span><br><span class="line">        name: &#x27;张&#x27;,</span><br><span class="line">        names: &#x27;三&#x27;</span><br><span class="line">    &#125;,</span><br><span class="line">    methods: &#123;</span><br><span class="line">        fn() &#123;</span><br><span class="line">            console.log(&#x27;fn函数被调用了&#x27;)</span><br><span class="line">            return this.name + &#x27;-&#x27; + this.names</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="14-姓名案例-计算属性实现"><a href="#14-姓名案例-计算属性实现" class="headerlink" title="14. 姓名案例-计算属性实现"></a>14. 姓名案例-计算属性实现</h2><ol><li>定义: 要用的属性不存在, 要通过已有属性计算得来</li><li>原理: 底层借助Object.defineProperty方法提供getter&#x2F;setter</li><li>get函数什么时候执行? (1) 初次读取时会执行一次 (2) 当依赖的数据发生改变会被再次调用</li><li>优势: 与methods实现相比: 内部有缓存机制, 效率更高, 调试方便</li><li>计算属性最终会出现在vm上, 直接读取使用即可</li><li>如果计算属性要被修改, 那必须要set函数去响应修改, 且set中要引起计算时依赖的数据发生改变</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    姓: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    名: &lt;input type=&quot;text&quot; v-model=&quot;names&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;fullname&#125;&#125;&lt;/span&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;fullname&#125;&#125;&lt;/span&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;fullname&#125;&#125;&lt;/span&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">let vm = new Vue(&#123;</span><br><span class="line">    el: &#x27;.box&#x27;,</span><br><span class="line">    data: &#123;</span><br><span class="line">        name: &#x27;张&#x27;,</span><br><span class="line">        names: &#x27;三&#x27;</span><br><span class="line">    &#125;,</span><br><span class="line">    computed: &#123;</span><br><span class="line">        fullname: &#123;</span><br><span class="line">    // get作用: 当读取fullname时, get会被调用, 且返回值作为fullname的值</span><br><span class="line">            get() &#123;</span><br><span class="line">                console.log(&#x27;get被调用了&#x27;)</span><br><span class="line">                console.log(this) // 指向vm实例 vue把get的this指向了vm</span><br><span class="line">                return this.name + &#x27;-&#x27; + this.names</span><br><span class="line">            &#125;,</span><br><span class="line">    // set什么时候调用: 当fullname被修改时调用</span><br><span class="line">            set(value) &#123;</span><br><span class="line">                console.log(value)</span><br><span class="line">                let arr = value.split(&#x27;-&#x27;)</span><br><span class="line">                this.name = arr[0]</span><br><span class="line">                this.names = arr[1]</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line">console.log(vm)</span><br></pre></td></tr></table></figure><h2 id="15-姓名案例-计算属性简写实现"><a href="#15-姓名案例-计算属性简写实现" class="headerlink" title="15. 姓名案例-计算属性简写实现"></a>15. 姓名案例-计算属性简写实现</h2><p>只有考虑读取, 不考虑修改才能用简写方式</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    姓: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    名: &lt;input type=&quot;text&quot; v-model=&quot;names&quot;&gt; &lt;br&gt;&lt;br&gt;</span><br><span class="line">    全名: &lt;span&gt;&#123;&#123;fullname&#125;&#125;&lt;/span&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">let vm = new Vue(&#123;</span><br><span class="line">    el: &#x27;.box&#x27;,</span><br><span class="line">    data: &#123;</span><br><span class="line">        name: &#x27;张&#x27;,</span><br><span class="line">        names: &#x27;三&#x27;</span><br><span class="line">    &#125;,</span><br><span class="line">    computed: &#123;</span><br><span class="line">        // 1. 简写</span><br><span class="line">        fullname() &#123;</span><br><span class="line">            console.log(&#x27;get被调用了&#x27;)</span><br><span class="line">            return this.name + &#x27;-&#x27; + this.names</span><br><span class="line">        &#125;</span><br><span class="line">        // 2. 完整写法</span><br><span class="line">        // fullname: &#123;</span><br><span class="line">        //     get() &#123;</span><br><span class="line">        //         console.log(&#x27;get被调用了&#x27;)</span><br><span class="line">        //         return this.name + &#x27;-&#x27; + this.names</span><br><span class="line">        //     &#125;</span><br><span class="line">        // &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org">XC's Blog</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">本文链接:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org/post/ou67/">https://webxc.eu.org/post/ou67/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明:</span> <span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a 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toc-level-2"><a class="toc-link" href="#2-vue%E7%9A%84%E6%A8%A1%E6%9D%BF-x2F-%E6%8C%87%E4%BB%A4%E8%AF%AD%E6%B3%95"><span class="toc-number"></span> <span class="toc-text">2. vue的模板&#x2F;指令语法</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#Vue%E6%A8%A1%E6%9D%BF%E8%AF%AD%E6%B3%95%E6%9C%892%E5%A4%A7%E7%B1%BB"><span class="toc-number">0.1.</span> <span class="toc-text">Vue模板语法有2大类:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E6%8F%92%E5%80%BC%E8%AF%AD%E6%B3%95"><span class="toc-number">1.</span> <span class="toc-text">1. 插值语法</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E6%8C%87%E4%BB%A4%E8%AF%AD%E6%B3%95"><span class="toc-number">2.</span> <span class="toc-text">2. 指令语法</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-vue%E7%9A%84%E5%8D%95%E9%A1%B9-x2F-%E5%8F%8C%E9%A1%B9%E6%95%B0%E6%8D%AE%E7%BB%91%E5%AE%9A"><span class="toc-number"></span> <span class="toc-text">3. vue的单项&#x2F;双项数据绑定</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-el%E5%92%8Cdata%E7%9A%84%E4%B8%A4%E7%A7%8D%E5%86%99%E6%B3%95"><span class="toc-number"></span> <span class="toc-text">4. el和data的两种写法</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-el%E6%9C%89%E4%B8%A4%E7%A7%8D%E5%86%99%E6%B3%95"><span class="toc-number">1.</span> <span class="toc-text">1. el有两种写法:</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-data%E6%9C%89%E4%B8%A4%E7%A7%8D%E5%86%99%E6%B3%95-1-%E5%AF%B9%E8%B1%A1%E5%BC%8F-2-%E5%87%BD%E6%95%B0%E5%BC%8F"><span class="toc-number">2.</span> <span class="toc-text">2. data有两种写法: 1. 对象式 2.函数式</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-Vue%E7%9A%84MVVM%E7%9A%84%E6%A8%A1%E5%9E%8B"><span class="toc-number"></span> <span class="toc-text">5. Vue的MVVM的模型</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#6-Object-defineProperty%E6%95%B0%E6%8D%AE%E4%BB%A3%E7%90%86%E6%96%B9%E6%B3%95"><span class="toc-number"></span> <span class="toc-text">6. 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